Voltage conversion circuit, junction box, inverter, laminated photovoltaic module and system

Abstract

The invention discloses a voltage conversion circuit suitable for a laminated photovoltaic module, a junction box, an inverter, the laminated photovoltaic module and a system, and relates to the technical field of photoelectric conversion. The laminated photovoltaic module comprises a first battery string and a second battery string which are arranged in a laminated manner; the voltage conversion circuit comprises a first maximum power tracking module and a first voltage conversion module; the first maximum power tracking module is electrically connected with the first battery string and the first voltage conversion module respectively; the first maximum power tracking module is used for tracking the maximum output power of the first battery string and outputting a first output signal of the first battery string at the maximum power; the first voltage conversion module is used for converting the voltage of the first output signal, so that the voltage of the first output signal is equal to the voltage of the second output signal of the second battery string. According to the technical scheme, the voltage of the first battery string is matched with the voltage of the second battery string in the laminated photovoltaic module, so that the module structure is simplified, and the module cost is reduced.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of photovoltaic technology, and in particular to a voltage conversion circuit, a junction box, an inverter, a laminated photovoltaic module and a system. Background Art

[0002] The laminated photovoltaic module may include two types of cell strings arranged in a stacked manner, and the two types of cell strings can perform photoelectric conversion respectively, so that the laminated photovoltaic module can have the advantages of the two types of cell strings, which is beneficial to improving the photoelectric conversion efficiency of the photovoltaic module.

[0003] However, due to the problem of output voltage mismatch between the two types of battery strings in the stacked photovoltaic module, when the electric energy generated by the stacked photovoltaic module needs to be applied to AC equipment or connected to the mains power grid, it is usually necessary to configure inverters and other devices for the two types of battery strings in the stacked photovoltaic module separately, making the grid-connected circuit of the stacked photovoltaic module more complicated, thereby increasing the cost and complexity of the stacked photovoltaic module system. Summary of the invention

[0004] The present invention provides a voltage conversion circuit, a junction box, an inverter, a laminated photovoltaic module and a system to simplify the inverter structure of the laminated photovoltaic module and reduce the grid-connected cost of the laminated photovoltaic module.

[0005] A first aspect of the present invention provides a voltage conversion circuit applicable to a laminated photovoltaic module, wherein the laminated photovoltaic module comprises a first battery string and a second battery string arranged in a stacked manner, and the voltage conversion circuit comprises: a first maximum power tracking module and a first voltage conversion module;

[0006] The first maximum power tracking module is electrically connected to the first battery string and the first voltage conversion module respectively; the first maximum power tracking module is used to track the maximum output power of the first battery string and output a first output signal of the first battery string at the maximum power;

[0007] The first voltage conversion module is used to convert the voltage of the first output signal so that the voltage of the first output signal is equal to the voltage of the second output signal of the second battery string.

[0008] Optionally, the first voltage conversion module includes a voltage conversion unit and a voltage feedback unit;

[0009] The voltage feedback unit is electrically connected to the voltage conversion unit and the second battery string respectively; the voltage feedback unit is used to obtain the second output signal of the second battery string and feed back the voltage of the second output signal to the voltage conversion unit;

[0010] The voltage conversion unit is also electrically connected to the first maximum power tracking module; the voltage conversion unit is used to convert the voltage of the first output signal into the voltage of the second output signal according to the voltage of the second output signal.

[0011] Optionally, the voltage conversion unit includes a DC / DC converter.

[0012] Optionally, the voltage conversion circuit further includes: a second maximum power tracking module;

[0013] The second maximum power tracking module is at least electrically connected to the second battery string; the second maximum power tracking module is at least used to track the maximum output power of the second battery string and output a second output signal of the second battery string.

[0014] Optionally, the positive input terminal of the second maximum power tracking module is electrically connected to the positive output terminal of the voltage conversion unit and the positive electrode of the second battery string, and the negative input terminal of the second maximum power tracking module is electrically connected to the negative output terminal of the voltage conversion unit and the negative electrode of the second battery string.

[0015] Optionally, the positive input terminal of the second maximum power tracking module is electrically connected to the positive pole of the second battery string, and the negative input terminal of the second maximum power tracking module is electrically connected to the negative pole of the second battery string; the positive output terminal of the second maximum power tracking module is electrically connected to the positive input terminal of the voltage feedback unit, and the negative output terminal of the second maximum power tracking module is electrically connected to the negative input terminal of the voltage feedback unit.

[0016] Optionally, the positive output terminal of the second maximum power tracking module is connected in parallel with the positive output terminal of the voltage conversion unit, and the negative output terminal of the second maximum power tracking module is connected in parallel with the negative output terminal of the voltage conversion unit.

[0017] Optionally, the voltage conversion circuit further includes: a second voltage conversion module;

[0018] The second voltage conversion module is electrically connected to the second battery string; the second voltage conversion module is used to convert the voltage of the second output signal of the second battery string into a set voltage;

[0019] The first voltage conversion module is specifically configured to convert the voltage of the first output signal into the set voltage.

[0020] Optionally, the voltage conversion circuit further includes: a second maximum power tracking module;

[0021] The second voltage conversion module is electrically connected to the second battery string through the second maximum power tracking module; the second maximum power tracking module is used to track the maximum output power of the second battery string and output a second output signal of the second battery string.

[0022] Optionally, the first voltage conversion module and the second voltage conversion module both include a DC / DC converter.

[0023] Optionally, the power of the first output signal is greater than the power of the second output signal.

[0024] A second aspect of the present invention provides a junction box suitable for a laminated photovoltaic module, wherein the laminated photovoltaic module comprises a first battery string and a second battery string arranged in a stacked manner, and the junction box comprises: the above-mentioned voltage conversion circuit.

[0025] Optionally, the voltage conversion circuit further includes a first bypass protection module;

[0026] The first bypass protection module is connected in parallel between the positive electrode and the negative electrode of the first battery string.

[0027] Optionally, the first bypass protection module includes at least one first bypass diode;

[0028] The first bypass diode is connected in reverse parallel between the positive electrode and the negative electrode of the first battery string.

[0029] Optionally, the voltage conversion circuit further includes a second bypass protection module;

[0030] The second bypass protection module is connected in parallel between the positive electrode and the negative electrode of the second battery string.

[0031] Optionally, the second bypass protection module includes at least one second bypass diode;

[0032] The second bypass diode is connected in reverse parallel between the positive electrode and the negative electrode of the second battery string.

[0033] Optionally, the second battery string includes n second battery groups connected in series; each of the second battery groups includes at least one second battery connected in series; n is a positive integer greater than or equal to 2;

[0034] The second bypass protection module includes n second bypass diodes; each of the second bypass diodes is connected in reverse parallel between each of the second battery groups in a one-to-one correspondence.

[0035] Optionally, the junction box further comprises: a positive electrode terminal and a negative electrode terminal;

[0036] The positive terminal is used to output the positive signal converted by the voltage conversion circuit;

[0037] The negative electrode terminal is used to output the negative electrode signal converted by the voltage conversion circuit.

[0038] Optionally, the junction box further includes: a box body; and the voltage conversion circuit is integrated in the box body.

[0039] A third aspect of the present invention provides a laminated photovoltaic module, the laminated photovoltaic module comprising a first battery string and a second battery string which are stacked; the laminated photovoltaic module also comprises the above-mentioned junction box.

[0040] Optionally, the first battery string includes a plurality of first batteries, a first bus bar and a second bus bar connected in series in sequence; the first bus bar is electrically connected to the positive electrode of the first battery at the first position in the series connection, and the second bus bar is electrically connected to the negative electrode of the first battery at the last position in the series connection;

[0041] The second battery string comprises a plurality of second batteries, a third bus bar and a fourth bus bar connected in series in sequence; the third bus bar is electrically connected to the positive electrode of the first second battery in the series, and the fourth bus bar is electrically connected to the negative electrode of the last second battery in the series;

[0042] The voltage conversion circuit of the junction box is electrically connected to the first bus bar, the second bus bar, the third bus bar, and the fourth bus bar, respectively.

[0043] Optionally, the laminated photovoltaic module further includes: a first glass substrate, a first battery layer, a first spacer layer and a second battery layer; the first battery layer includes the first battery; the second battery layer includes the second battery;

[0044] The second battery layer is located on the front side of the first glass substrate, and the junction box is arranged on the back side of the first glass substrate; the front and back sides of the first glass substrate are opposite sides; the first spacer layer is located on the side of the second battery layer away from the first glass substrate; the first battery layer is located on the side of the first spacer layer away from the second battery layer;

[0045] At least one through hole is provided on the first glass substrate; the first bus bar, the second bus bar, the third bus bar and the fourth bus bar are electrically connected to the voltage conversion circuit through the through hole.

[0046] Optionally, the laminated photovoltaic module further includes: a second glass substrate located on a side of the first cell layer facing away from the second cell layer.

[0047] Optionally, the first battery string includes a plurality of perovskite batteries connected in series, and the second battery string includes a plurality of crystalline silicon batteries connected in series.

[0048] A fourth aspect of the present invention provides a photovoltaic system, the photovoltaic system comprising: an inverter and at least one of the above-mentioned laminated photovoltaic modules;

[0049] The junction box of the laminated photovoltaic module at least includes a positive terminal and a negative terminal;

[0050] The positive input terminal of the inverter is electrically connected to the positive terminal, and the negative input terminal of the inverter is electrically connected to the negative terminal.

[0051] Optionally, when the photovoltaic system includes a plurality of laminated photovoltaic modules, the junction boxes of the laminated photovoltaic modules are connected in series.

[0052] A fifth aspect of the present invention provides an inverter suitable for a laminated photovoltaic module, wherein the laminated photovoltaic module comprises a first battery string and a second battery string arranged in a stacked manner, and the inverter comprises: a signal conversion circuit and the above-mentioned voltage conversion circuit;

[0053] The voltage conversion circuit is used to convert the voltage of the first battery string and / or the second battery string and output a DC signal of the laminated photovoltaic module;

[0054] The signal conversion circuit is electrically connected to the voltage conversion circuit; the signal conversion circuit is used to convert the DC signal into an AC signal.

[0055] Optionally, the signal conversion circuit includes a DC / AC converter.

[0056] A sixth aspect of the present invention provides a photovoltaic system, the photovoltaic system comprising: at least one laminated photovoltaic module and the above inverter;

[0057] The laminated photovoltaic module comprises a first battery string and a second battery string which are stacked;

[0058] The inverter is electrically connected to the first battery string and the second battery string respectively.

[0059] Optionally, when the photovoltaic system includes a plurality of stacked photovoltaic modules, the first battery strings of each stacked photovoltaic module are connected in series, and the second battery strings of each stacked photovoltaic module are connected in series.

[0060] Optionally, the first battery string includes a plurality of first batteries, a first bus bar and a second bus bar connected in series in sequence; the first bus bar is electrically connected to the positive electrode of the first battery at the first position in the series connection, and the second bus bar is electrically connected to the negative electrode of the first battery at the last position in the series connection;

[0061] The second battery string comprises a plurality of second batteries, a third bus bar and a fourth bus bar connected in series in sequence; the third bus bar is electrically connected to the positive electrode of the first second battery in the series, and the fourth bus bar is electrically connected to the negative electrode of the last second battery in the series;

[0062] The first battery strings are connected in series through the first bus bar and the second bus bar, and the second battery strings are connected in series through the third bus bar and the fourth bus bar.

[0063] Optionally, the laminated photovoltaic module further includes a first glass substrate, a first battery layer, a first spacer layer and a second battery layer; the first battery layer includes the first battery, and the second battery layer includes the second battery;

[0064] The second battery layer is located on the front side of the first glass substrate, and the first spacer layer is located on the side of the second battery layer away from the first glass substrate; the first battery layer is located on the side of the first spacer layer away from the second battery layer;

[0065] At least one first through hole and at least one second through hole are provided on the first glass substrate; the first bus bar and the second bus bar extend to the back side of the first glass substrate through the first through hole; the third bus bar and the fourth bus bar extend to the back side of the first glass substrate through the second through hole.

[0066] Optionally, the laminated photovoltaic module further includes a second glass substrate located on a side of the first cell layer facing away from the second cell layer.

[0067] Optionally, the first battery string includes a plurality of perovskite batteries connected in series; and the second battery string includes a plurality of crystalline silicon batteries connected in series.

[0068] The technical solution provided by the present invention is to set a first maximum power tracking module and a first voltage conversion module in the voltage conversion circuit of the stacked photovoltaic module, so as to use the first maximum power tracking module to track the maximum output power of the first battery string in the stacked photovoltaic module, and output the first output signal of the first battery string to ensure that the first battery string can operate at the maximum power point, so that the stacked photovoltaic module has a higher output power; at the same time, the first voltage conversion module is used to convert the voltage of the first output signal output by the first battery string, so that the voltage of the first output signal of the first battery string can be equal to the voltage of the second output signal of the second battery string, so that when the DC signal output by the stacked photovoltaic module is subsequently converted into an AC signal, there is no need to set corresponding signal conversion circuits for the first battery string and the second battery string of the stacked photovoltaic module respectively, and the first output signal of the first battery string and the second output signal of the second battery string can be converted by the same signal conversion circuit, which is conducive to simplifying the structure of the grid-connected circuit of the stacked photovoltaic module, reducing the grid-connected cost of the stacked photovoltaic module, and further facilitating the simplification of the overall structure of the photovoltaic system and reducing the overall cost of the photovoltaic system.

[0069] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0071] Figure 1 is a schematic structural diagram of a voltage conversion circuit provided by an embodiment of the present invention;

[0072] Figure 2 is a schematic diagram of a membrane structure of a perovskite battery provided in an embodiment of the present invention;

[0073] Figure 3 is a schematic structural diagram of another voltage conversion circuit provided by an embodiment of the present invention;

[0074] Figure 4 is a structural schematic diagram of another voltage conversion circuit provided by an embodiment of the present invention;

[0075] Figure 5 is a structural schematic diagram of another voltage conversion circuit provided by an embodiment of the present invention;

[0076] Figure 6 is a structural schematic diagram of another voltage conversion circuit provided by an embodiment of the present invention;

[0077] Figure 7 is a structural schematic diagram of another voltage conversion circuit provided by an embodiment of the present invention;

[0078] Figure 8 is a structural schematic diagram of a junction box provided by an embodiment of the present invention;

[0079] Fig. 9 is a schematic structural diagram of another junction box provided by an embodiment of the present invention;

[0080] Fig.10 is a structural schematic diagram of another junction box provided by an embodiment of the present invention;

[0081] Fig.11 is a structural schematic diagram of another junction box provided by an embodiment of the present invention;

[0082] Figure 12 to Figure 14 Schematic diagrams of the structures of three other junction boxes provided by embodiments of the present invention;

[0083] Figures 15 to 17 Schematic diagrams of the structures of three other junction boxes provided by embodiments of the present invention;

[0084] Fig.18 and Fig.19 Schematic diagrams of the structures of two other junction boxes provided by embodiments of the present invention;

[0085] Fig. 20 is a schematic diagram of a top view of a first battery string provided by an embodiment of the present invention;

[0086] Fig.21 is a schematic diagram of a top view of a second battery string provided by an embodiment of the present invention;

[0087] Fig. 22 is a schematic diagram of a top view of another second battery string provided by an embodiment of the present invention;

[0088] Fig.23 is a schematic diagram of a film structure of a laminated photovoltaic module provided by an embodiment of the present invention;

[0089] Fig.24 is a schematic structural diagram of a photovoltaic system provided by an embodiment of the present invention;

[0090] Fig.25 is a schematic structural diagram of another photovoltaic system provided by an embodiment of the present invention;

[0091] Figure 26 to Figure 28 1 is a schematic diagram of the structures of three inverters provided in an embodiment of the present invention;

[0092] Fig.29 is a structural schematic diagram of another photovoltaic system provided by an embodiment of the present invention;

[0093] Figure 30 to Figure 32 Schematic diagrams of the structures of three photovoltaic systems provided by embodiments of the present invention;

[0094] Fig.33 is a schematic diagram of a top view of another first battery string provided by an embodiment of the present invention;

[0095] Fig.34 is a schematic diagram of a top view of another second battery pack provided by an embodiment of the present invention;

[0096] Fig.35 It is a schematic diagram of the film layer structure of another laminated photovoltaic module provided in an embodiment of the present invention.

[0097] In the figure: 10, laminated photovoltaic module; 11, first battery string, 110, first battery, 111, first bus bar, 112 second bus bar, 101, first transparent conductive layer, 102, first carrier functional layer, 103, perovskite layer, 104, second carrier functional layer, 105, second transparent conductive layer; 12, second battery string, 1200, second battery group, 120, second battery, 121, third bus bar, 122, fourth bus bar; 13, first glass substrate, H, through hole, H1, first through hole, H2, H21 and H22, second through hole, 14, first battery layer, 15, first spacer layer, 16, second battery layer, 17, second glass substrate, 18, bonding layer;

[0098] 20. voltage conversion circuit; 21. first maximum power tracking module; 22. first voltage conversion module; 221. voltage conversion unit; 222. voltage feedback unit; 23. second maximum power tracking module; 24. second voltage conversion module;

[0099] 30. Junction box; 25. First bypass protection module, D1 first bypass diode, 26. Second bypass protection module, D2, second bypass diode, 32. Positive terminal, 31. Box body, 33. Negative terminal;

[0100] 40 and 60, inverter; 50, signal conversion circuit;

[0101] 100 and 200, photovoltaic systems. DETAILED DESCRIPTION

[0102] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0103] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0104] An embodiment of the present invention provides a voltage conversion circuit suitable for a stacked photovoltaic module. The voltage conversion circuit can at least track the power of a first output signal of a first battery string, so that the first battery string can operate at a maximum power point. At the same time, the voltage conversion circuit can also at least convert the voltage of the first output signal of the first battery string in the stacked photovoltaic module, so that the voltage of the first output signal can match the voltage of the second output signal of the first battery string. When it is necessary to convert a DC signal output by the stacked photovoltaic module into an AC signal, a signal conversion circuit can be used to simultaneously convert the first output signal of the first battery string and the second output signal of the second battery string, thereby being able to simultaneously meet the signal conversion requirements of the first battery string and the second battery string in the stacked photovoltaic module.

[0105] Figure 1 is a schematic diagram of a voltage conversion circuit provided by an embodiment of the present invention, with reference to Figure 1 The laminated photovoltaic module 10 may include a first battery string 11 and a second battery string 12 stacked. For example, when the laminated photovoltaic module 10 is placed on a plane, the first battery string 11 may be located on a side of the second battery string 12 away from the plane, or the second battery string 12 may be located on a side of the first battery string 11 away from the plane. The specific design may be based on actual needs. The embodiment of the present invention does not specifically limit this. It is understandable that in order to simultaneously show the first battery string 11 and the second battery string 12, Figure 1The schematic diagram of the film layer structure of the laminated photovoltaic module is shown only for exemplary purposes.

[0106] In an optional embodiment, the first battery string 11 may include a plurality of first batteries connected in series, the second battery string 12 may include a plurality of second batteries connected in series, and one of the first battery and the second battery may be a perovskite battery, such as Figure 2 As shown, the perovskite cell may include a first transparent conductive layer 101, a first carrier functional layer 102, a perovskite layer 103, a second carrier functional layer 104 and a second transparent conductive layer 105, which are stacked in sequence. The first carrier functional layer 102 may include an electron transport layer, and the second carrier functional layer 104 may include a hole transport layer, so that when the perovskite layer 103 absorbs sunlight and generates photogenerated carriers, the first carrier functional layer 102 and the second carrier functional layer 104 can be selectively transmitted respectively, so that a photogenerated current can be generated in a circuit electrically connected to the first transparent conductive layer 101 and the second transparent conductive layer 105. Among them, one of the first transparent conductive layer 101 and the second transparent conductive layer 105 can be the positive electrode of the perovskite battery component, and the other can be the negative electrode of the perovskite battery component. The first transparent conductive layer 101 and the second transparent conductive layer 105 can include transparent conductive materials such as tin oxide or indium tin oxide; the perovskite layer 103 can include perovskite-type organic metal halide semiconductor materials such as methylamine lead iodide perovskite (CH3NH3PbI3). It can be understood that the materials of each film layer can be designed according to actual needs, and the embodiment of the present invention does not specifically limit this.

[0107] In another optional embodiment, when one of the first battery and the second battery is a perovskite battery, the other may be a crystalline silicon battery, which may be made of crystalline silicon materials known to those skilled in the art, such as polycrystalline silicon or monocrystalline silicon, and may be specifically designed according to actual needs, which is not specifically limited in the embodiment of the present invention. The crystalline silicon battery may also include a positive electrode and a negative electrode for outputting holes and electrons, respectively, so that the photogenerated carriers generated by the crystalline silicon battery can be output through its positive electrode and negative electrode, respectively.

[0108] It is understandable that when one of the first cell string 11 and the second cell string 12 is a perovskite cell and the other is a crystalline silicon cell, the area of ​​the first cell string 11 of the same laminated photovoltaic module is similar to that of the second cell string 12 to facilitate assembly of the first cell string 11 and the second cell string 12 and to prevent space waste. However, due to the difference in photoelectric conversion efficiency between perovskite cells and crystalline silicon cells, the output signals of the first cell string 11 and the second cell string 12 have different voltages, so that the same signal conversion circuit cannot be used to directly convert the DC signals output by the first cell string 11 and the second cell string 12 into AC signals.

[0109] Continue to refer Figure 1 The voltage conversion circuit 20 of the laminated photovoltaic module 10 provided in the embodiment of the present invention includes a first maximum power tracking module 21 and a first voltage conversion module 22; the input end of the first maximum power tracking module 21 is electrically connected to the first battery string 11 and the first voltage conversion module 22 respectively, the first maximum power tracking module 21 is used to track the first output signal of the first battery string 11, and output the first output signal of the first battery string 11 at maximum power; the first voltage conversion module 22 is used to convert the voltage of the first output signal so that the voltage of the first output signal is equal to the voltage of the second output signal of the second battery string.

[0110] The first output signal may include the output current and output voltage of the first battery string 11, and the second output signal may include the output current and output voltage of the second battery string 12. The first maximum power tracking module 21 may include a positive input terminal and a negative input terminal. The positive input terminal of the first maximum power tracking module 21 may be electrically connected to the positive electrode of the first battery string 11, and the negative input terminal of the first maximum power tracking module 21 may be electrically connected to the negative electrode of the first battery string 11, so that the first maximum power tracking module 21 can obtain the current signal and voltage signal output by the first battery string 11.

[0111] Due to the influence of factors such as the external environment, the output power of the battery string will change accordingly. For example, when the sunlight in the environment is strong, the battery string can generate more photogenerated carriers, that is, the output power of the battery string is relatively high, and vice versa, the output power of the battery string is relatively low. By setting the first maximum power tracking module 21 to monitor the output current and output voltage of the first battery string 11 in real time, the maximum output power of the first battery string 11 is tracked, so that the first battery string 11 can continue to work at the maximum power point, which is conducive to improving the output power of the first battery string 11, so as to meet the power demand in various scenarios.

[0112] The first maximum power tracking module 21 may also be electrically connected to the first voltage conversion module 22 , so that the first output signal output by the first maximum power tracking module 21 may be input into the first voltage conversion module 22 for voltage conversion. The first voltage conversion module 22 may include a positive input terminal and a negative input terminal, and the first maximum power tracking module 21 may include a positive output terminal and a negative output terminal. At this time, the positive input terminal of the first voltage conversion module 22 may be electrically connected to the positive output terminal of the first maximum power tracking module 21, and the negative input terminal of the first voltage conversion module 22 may be electrically connected to the negative output terminal of the first maximum power tracking module 21, so that the first voltage conversion module 22 can obtain the voltage and current of the first output signal of the first battery string 11 output by the first maximum power tracking module 21, and convert the voltage of the first output signal so that the voltage of the converted first output signal can be equal to the voltage of the second output signal of the second battery string 12, so that when the first output signal and the second output signal are both input into the signal conversion circuit, it can be prevented that the voltage of the first output signal input into the signal conversion circuit is different from the voltage of the second output signal, so that the first output signal and the second output signal will interfere with each other, resulting in the problem of noise in the AC signal converted by the signal conversion circuit, thereby simplifying the structure of the signal conversion circuit used in grid connection and improving the stability and reliability of signal conversion.

[0113] In this embodiment, a first maximum power tracking module and a first voltage conversion module are provided in the voltage conversion circuit of the stacked photovoltaic module, so that the first maximum power tracking module is used to track the maximum output power of the first battery string in the stacked photovoltaic module, and output the first output signal of the first battery string, so as to ensure that the first battery string can operate at the maximum power point, so that the stacked photovoltaic module has a higher output power; at the same time, the first voltage conversion module is used to convert the voltage of the first output signal output by the first battery string, so that the voltage of the first output signal of the first battery string can be equal to the voltage of the second output signal of the second battery string, so that when the DC signal output by the stacked photovoltaic module is subsequently converted into an AC signal, there is no need to respectively provide corresponding signal conversion circuits for the first battery string and the second battery string of the stacked photovoltaic module, so that the first output signal of the first battery string and the second output signal of the second battery string can be converted by the same signal conversion circuit, thereby simplifying the structure of the grid-connected circuit of the stacked photovoltaic module, reducing the grid-connected cost of the stacked photovoltaic module, and further simplifying the overall structure of the photovoltaic system, and reducing the overall cost of the photovoltaic system.

[0114] It should be noted that Figure 1The accompanying drawings are only exemplary of the embodiments of the present invention. Under the premise that the core invention of the embodiments of the present invention can be realized, the embodiments of the present invention do not limit the specific structure and connection method of each module in the voltage conversion circuit applicable to the laminated photovoltaic module. The structure and working principle of the voltage conversion circuit applicable to the laminated photovoltaic module provided by the embodiments of the present invention are exemplarily described below with a typical example.

[0115] Optional, Figure 3 is a schematic diagram of the structure of another voltage conversion circuit provided by an embodiment of the present invention, such as Figure 3 As shown, the first voltage conversion module 22 may include a voltage conversion unit 221 and a voltage feedback unit 222; the voltage feedback unit 222 is electrically connected to the voltage conversion unit 221 and the second battery string 12 respectively; the voltage feedback unit 222 is used to obtain the second output signal of the second battery string 12, and feed back the voltage of the second output signal to the voltage conversion unit 221; the voltage conversion unit 221 is also electrically connected to the first maximum power tracking module 21; the voltage conversion unit 221 is used to convert the voltage of the first output signal into the voltage of the second output signal according to the voltage of the second output signal.

[0116] Among them, the voltage feedback unit 222 may include a positive input terminal and a negative input terminal, the positive input terminal of the voltage feedback unit 222 can be electrically connected to the positive pole of the second battery string 12, and the negative input terminal of the voltage feedback unit 222 can be electrically connected to the negative pole of the second battery string 12, so that the voltage feedback unit 222 can obtain the voltage of the second output signal of the second battery string 12 in real time, and feed back the voltage of the second output signal to the voltage conversion unit 221.

[0117] The voltage conversion unit 221 may include a positive input terminal, a negative input terminal and a signal feedback terminal. The positive input terminal of the voltage conversion unit 221 can be electrically connected to the positive output terminal of the first maximum power tracking module 21, and the negative input terminal of the voltage conversion unit 221 can be electrically connected to the negative output terminal of the first maximum power tracking module 21, so that the voltage conversion unit 221 can receive the first output signal output by the first maximum power tracking module 21; at the same time, the signal feedback terminal of the voltage conversion unit 221 is electrically connected to the output terminal of the voltage feedback unit 222, so that the voltage conversion unit 221 can convert the voltage of the first output signal output by the first maximum power tracking module 21 into the voltage of the second output signal according to the voltage of the second output signal fed back by the voltage feedback unit 222, so that the voltage of the first output signal can be the same as the voltage of the second output signal.

[0118] In addition, the voltage conversion unit 221 may also include a positive output terminal and a negative output terminal. The positive output terminal of the voltage conversion unit 221 can be electrically connected to the positive electrode of the second battery string 12, and the negative output terminal of the voltage conversion unit 221 can be electrically connected to the negative electrode of the second battery string 12, so that the first output signal after voltage conversion by the voltage conversion unit 221 can be combined with the signal of the second battery string 12, and then output to the signal conversion circuit for signal conversion, or provided to the DC device to power the DC device.

[0119] In this embodiment, the first voltage conversion module includes a voltage conversion unit and a voltage feedback unit, and the voltage feedback unit is used to obtain the voltage of the second output signal of the second battery string, and the voltage of the second output signal is fed back to the voltage conversion unit, so that the voltage conversion unit can convert the voltage of the first output signal output by the first maximum power tracking module according to the voltage of the second output signal, so that the voltage of the first output signal can be the same as the voltage of the second output signal, so that the signal output by the stacked photovoltaic module has higher stability and reliability. At the same time, when the DC signal output by the stacked photovoltaic module is converted into an AC signal, the structure of the corresponding signal conversion circuit can be simplified, which is conducive to reducing the cost of the stacked photovoltaic system including the voltage conversion circuit.

[0120] It should be noted that the above is only an exemplary description of the voltage feedback unit obtaining the voltage of the second output signal of the second battery string, and the voltage conversion unit performing voltage conversion on the voltage of the first output signal of the first battery string. In other embodiments of the present invention, the voltage feedback unit may also feed back the first output signal of the first battery string. In this case, the voltage conversion unit may also convert the voltage of the second output signal of the second battery string according to the voltage of the first output signal of the first battery string, so that the voltage of the converted second output signal may be the same as the voltage of the first output signal. In this case, the stability and reliability of the output signal of the stacked photovoltaic module can also be improved, and the structure of the signal conversion circuit can be simplified. The specific implementation method can be designed according to actual needs, and the embodiment of the present invention does not make specific limitations on this.

[0121] In an optional embodiment, the voltage feedback unit can feed back the voltage of the smaller one of the first output signal and the second output signal to the voltage conversion unit, and the voltage conversion unit can perform voltage conversion on the larger one of the first output signal and the second output signal. For example, the power of the first output signal can be greater than the power of the second output signal.

[0122] As a feasible embodiment, when the first battery string includes a plurality of first batteries connected in series, the second battery string includes a second battery connected in series, and one of the first battery and the second battery is a perovskite battery and the other is a crystalline silicon battery, under the condition that the light receiving area is the same, the output power of the perovskite battery is greater than the output power of the crystalline silicon battery. At this time, the second battery string electrically connected to the voltage feedback unit may be a crystalline silicon battery string, and the first maximum power tracking module electrically connected to the voltage conversion unit may be a maximum power tracking module electrically connected to the perovskite battery string.

[0123] As another feasible embodiment, when the first battery string includes a plurality of first batteries connected in series, the second battery string includes a second battery connected in series, and one of the first battery and the second battery is a perovskite battery and the other is a crystalline silicon battery, the second battery string electrically connected to the voltage feedback unit may also be a perovskite battery string, and the first maximum power tracking module electrically connected to the voltage conversion unit may also be a maximum power tracking module electrically connected to the crystalline silicon battery string. The specific implementation method may be designed according to actual needs.

[0124] For ease of description, without special limitations, the embodiments of the present invention all take the example of a voltage conversion unit converting a first output signal into a voltage and a voltage feedback unit feeding back the voltage of a second output signal to exemplarily illustrate the technical solutions of the embodiments of the present invention.

[0125] Based on the above embodiment, optionally, Figure 4 is a schematic diagram of the structure of another voltage conversion circuit provided by an embodiment of the present invention, such as Figure 4 As shown, the voltage conversion circuit 20 also includes a second maximum power tracking module 23; the second maximum power tracking module 23 is electrically connected to at least the second battery string 12; the second maximum power tracking module 23 is at least used to track the maximum output power of the second battery string 12 and output a second output signal of the second battery string 12.

[0126] Among them, the second maximum power tracking module 23 may include a positive input terminal and a negative input terminal, the positive input terminal of the second maximum power tracking module 23 may be electrically connected to the positive electrode of the second battery string 12, and the negative input terminal of the second maximum power tracking module 23 may be electrically connected to the negative electrode of the second battery string 12, so that the second maximum power tracking module 23 can obtain the current signal and voltage signal output by the second battery string 12. The second maximum power tracking module 23 can monitor the output current and output voltage of the second battery string 12 in real time to track the maximum output power of the second battery string 12, so that the second battery string 12 can continue to operate at the maximum power point, which is conducive to improving the output power of the second battery string 12, so as to meet the power demand in various scenarios.

[0127] It should be noted that when the voltage conversion circuit includes a second maximum power tracking module, the voltage feedback unit can be directly electrically connected to the second battery string, or the voltage feedback unit can also be indirectly electrically connected to the second battery string through the second maximum power tracking module. The specific design can be based on actual needs, and the embodiment of the present invention does not make specific limitations on this.

[0128] In an optional embodiment, if Figure 4 As shown, the positive input terminal of the second maximum power tracking module 23 is electrically connected to the positive output terminal of the voltage conversion unit 221 and the positive electrode of the second battery string 12, and the negative input terminal of the second maximum power tracking module 23 is electrically connected to the negative output terminal of the voltage conversion unit 221 and the negative electrode of the second battery string 12. At this time, the positive electrode of the second battery string 12 is electrically connected to the positive output terminal of the voltage conversion unit 221, the negative electrode of the second battery string 12 is electrically connected to the negative output terminal of the voltage conversion unit 221, and the positive input terminal of the voltage feedback unit 222 can be directly electrically connected to the positive electrode of the second battery string 12, and the negative input terminal of the voltage feedback unit 222 can be directly electrically connected to the negative electrode of the second battery string 12, so that the voltage feedback unit 222 can directly obtain the voltage of the second output signal of the second battery string 12, and directly feed back the voltage of the second output signal to the voltage conversion unit 221, so that the voltage conversion unit 221 can convert the voltage of the first output signal output by the first maximum power tracking module 21 into the voltage of the second output signal according to the voltage of the second output signal, so that the first output signal after voltage conversion by the voltage conversion unit 221 can be combined and output with the second output signal of the second battery string 12 at the positive output terminal and the negative output terminal of the voltage conversion unit 221, so that the laminated photovoltaic module can stably output the corresponding DC signal.

[0129] Based on the above embodiment, optionally, continue to refer to Figure 4 , the positive input terminal of the second maximum power tracking module 23 is electrically connected to the positive output terminal of the voltage conversion unit 221 and the positive electrode of the second battery string 12, and the negative input terminal of the second maximum power tracking module 23 is electrically connected to the negative output terminal of the voltage conversion unit 221 and the negative electrode of the second battery string 12. At this time, the second output signal output by the second battery string 12 and the first output signal after voltage conversion by the voltage conversion unit 221 can be provided to the second maximum power tracking module 23 at the same time, so that the second output signal output by the second battery string 12 and the first output signal after voltage conversion can work at the highest power point after being connected in parallel, so that the signal output by the voltage conversion circuit 20 has a larger power, which is beneficial to improving the economy of the laminated photovoltaic module.

[0130] In another alternative embodiment, Figure 5is a schematic diagram of the structure of another voltage conversion circuit provided by an embodiment of the present invention, such as Figure 5 As shown, the positive input terminal of the second maximum power tracking module 23 is electrically connected to the positive terminal of the second battery string 12, and the negative input terminal of the second maximum power tracking module 23 is electrically connected to the negative terminal of the second battery string 12; the positive output terminal of the second maximum power tracking module 23 is electrically connected to the positive input terminal of the voltage feedback unit 222, and the negative output terminal of the second maximum power tracking module 23 is electrically connected to the negative input terminal of the voltage feedback unit 222. At this time, the voltage feedback unit 222 is indirectly electrically connected to the second battery string 12 through the second maximum power tracking module 23.

[0131] Among them, when the voltage feedback unit 222 is indirectly electrically connected to the second battery string 12 through the second maximum power tracking module 23, the second maximum power tracking module 23 tracks the maximum power of the second battery string 12, and outputs the second output signal of the second battery string 12 to the voltage feedback unit 222, so that the voltage feedback unit 222 can feed back the voltage of the second output signal output by the second maximum power tracking module 23 to the voltage conversion unit 221.

[0132] In addition, based on the above embodiment, optionally, the positive output terminal of the second maximum power tracking module 23 can also be electrically connected in parallel with the positive output terminal of the voltage conversion unit 221, and the negative output terminal of the second maximum power tracking module 23 can also be connected in parallel with the negative output terminal of the voltage conversion unit 221, so that the first output signal converted by the voltage conversion unit 221 and the second output signal output by the second maximum power tracking module 23 are combined and output simultaneously, and provided to the corresponding DC device, or provided to the corresponding signal conversion circuit for signal conversion.

[0133] It is understandable that the above description only exemplarily illustrates the connection relationship between the voltage conversion unit 221 and the voltage feedback unit 222 and other modules when the first voltage conversion module 22 includes the voltage conversion unit 221 and the voltage feedback unit 222. On the premise that the functions of the voltage conversion unit 221 and the voltage feedback unit 222 can be realized, the embodiment of the present invention does not limit the specific structure of the voltage conversion unit 221 and the voltage feedback unit 222. In an optional embodiment, the voltage conversion unit 221 may include a DC / DC converter, so that the first output signal converted by the voltage conversion unit 221 remains a stable DC signal.

[0134] As another possible embodiment, Figure 6 is a schematic diagram of the structure of another voltage conversion circuit provided by an embodiment of the present invention, such as Figure 6As shown, the voltage conversion circuit 20 may also include a second voltage conversion module 24, which is electrically connected to the second battery string 12; the second voltage conversion module 24 is used to convert the voltage of the second output signal of the second battery string 12 into a set voltage; at this time, the first voltage conversion module 22 is specifically used to convert the voltage of the first output signal into a set voltage.

[0135] Among them, the set voltage can be a voltage value pre-set according to actual needs. For example, the voltage of the first output signal of the first battery string 11 and the voltage of the second output signal of the second battery string 12 can be comprehensively considered to determine the maximum voltage that can be reached by the first output signal of the first battery string 11 after voltage conversion by the first voltage conversion module 22 and the second output signal of the second battery string 12 after voltage conversion by the second voltage conversion module 24. The maximum voltage can be determined as the set voltage so that the stacked photovoltaic module 10 can have a higher output power.

[0136] It can be understood that the first voltage conversion module 22 may include a positive input terminal, a negative input terminal, a positive output terminal and a negative output terminal, and the second voltage conversion module 24 may also include a positive input terminal, a negative input terminal, a positive output terminal and a negative output terminal. At this time, the positive input terminal of the first voltage conversion module 22 can be electrically connected to the positive output terminal of the first maximum power tracking module 21, and the negative output terminal of the first voltage conversion module 22 can be electrically connected to the negative output terminal of the first maximum power tracking module 21; the positive input terminal of the second voltage conversion module 24 can be electrically connected to the positive electrode of the second battery string 12, The negative input terminal of the second voltage conversion module 24 can be electrically connected to the negative electrode of the second battery string 12; the positive output terminal of the first voltage conversion module 22 can be connected in parallel with the positive output terminal of the second voltage conversion module 24, and the negative output terminal of the first voltage conversion module 22 can be connected in parallel with the negative output terminal of the second voltage conversion module 24, so that the first output signal converted by the first voltage conversion module 22 and the second output signal converted by the second voltage conversion module 24 are combined and provided to the DC device at the same time, or, provided to the corresponding signal conversion circuit for signal conversion at the same time.

[0137] Based on the above embodiment, optionally, Figure 7 is a schematic diagram of the structure of another voltage conversion circuit provided by an embodiment of the present invention, such as Figure 7 As shown, the voltage conversion circuit 20 may further include a second maximum power tracking module 23; at this time, the second voltage conversion module 24 is electrically connected to the second battery string 12 through the second maximum power tracking module 23; the second maximum power tracking module 23 is used to track the maximum output power of the second battery string 12 and output a second output signal of the second battery string 12.

[0138] Among them, the positive input terminal of the second voltage conversion module 24 can be electrically connected to the positive output terminal of the second maximum power tracking module 23, and the negative input terminal of the second voltage conversion module 24 can be electrically connected to the negative output terminal of the second maximum power tracking module 23, so that the second output signal output by the second maximum power tracking module 23 can be provided to the second voltage conversion module 24, so that the second voltage conversion module 24 can convert the voltage of the second output signal and output a second output signal with a set voltage.

[0139] The technical solution of this embodiment, by setting the first voltage conversion module and the second voltage conversion module in the voltage conversion circuit, can make the first output signal of the first battery string and the second output signal of the second battery string have the same voltage, so that the voltage conversion circuit can simultaneously output the first output signal and the second output signal with the same voltage, which is beneficial to improve the stability of the DC signal output by the stacked photovoltaic module. Signal and reliability.

[0140] It is understandable that, under the premise that the first voltage conversion module 22 can convert the voltage of the first output signal into the set voltage, and the second voltage conversion module 24 can convert the voltage of the second output signal into the set voltage, the embodiment of the present invention does not limit the specific structure of the first voltage conversion module 22 and the second voltage conversion module 24, and can be designed according to actual needs. In an optional embodiment, the first voltage conversion module 22 and the second voltage conversion module 24 can both include a DC / DC converter, so that the first output signal after voltage conversion by the first voltage conversion module 22 and the second output signal after voltage conversion by the second voltage conversion module 24 can still be a stable DC signal.

[0141] Based on the same inventive concept, an embodiment of the present invention further provides a junction box suitable for a laminated photovoltaic module, the laminated photovoltaic module includes a first battery string and a second battery string arranged in a stacked manner, and the junction box may include the voltage conversion circuit provided by the embodiment of the present invention. Therefore, the junction box provided by the embodiment of the present invention includes the technical features of the voltage conversion circuit provided by the embodiment of the present invention, and can achieve the beneficial effects of the voltage conversion circuit provided by the embodiment of the present invention. The similarities can be referred to the above description and will not be repeated here.

[0142] Based on the above embodiment, optionally, Figure 8 is a schematic diagram of the structure of a junction box provided by an embodiment of the present invention, such as Figure 8As shown, the junction box 30 may further include a box body 31; in this case, the voltage conversion circuit 20 is integrated into the box body 31, so that the box body 31 can be used to protect the voltage conversion circuit 20, so that the voltage conversion circuit 20 is protected from external impact and corrosion, etc., which is beneficial to improve the service life of the junction box 30 and reduce the overall cost of the laminated photovoltaic module 10.

[0143] Based on the above embodiment, optionally, Fig. 9 is a schematic diagram of the structure of another junction box provided by an embodiment of the present invention, Fig.10 is a structural schematic diagram of another junction box provided by an embodiment of the present invention, Fig.11 is a schematic diagram of the structure of another junction box provided by an embodiment of the present invention, referring to Figures 9 to 11 The voltage conversion circuit 20 also includes a first bypass protection module 25 ; the first bypass protection module 25 is connected in parallel between the positive electrode and the negative electrode of the first battery string 11 .

[0144] Among them, the first bypass protection module 25 can shunt the current of the first output signal output by the first battery string 11, maintain the voltage stability of the first battery string 11, improve the photoelectric conversion efficiency of the first battery string 11, prevent the high-impedance first battery 110 in the first battery string 11 from overheating, protect each first battery 110 from thermal damage, and extend the service life of the first battery string 11; at the same time, the first bypass protection module 25 can also prevent reverse current that may occur due to voltage imbalance in the first battery string 11 and between the first batteries 110, ensure the correct current direction, and protect the first battery string 11 from damage.

[0145] In an optional embodiment, continue to refer to Figures 9 to 11 The first bypass protection module 25 includes at least one first bypass diode D1 ; the first bypass diode D1 is connected in reverse parallel between the positive electrode and the negative electrode of the first battery string 11 .

[0146] The first bypass protection module 25 includes at least one first bypass diode D1 , that is, the first bypass protection module 25 may include one or more first bypass diodes D1 , which may be specifically designed according to actual needs, and the embodiment of the present invention does not specifically limit this.

[0147] Based on the above embodiment, optionally, Figure 12 to Figure 14 is a schematic diagram of the structure of three other junction boxes provided in an embodiment of the present invention, referring to Figure 12 to Figure 14 The voltage conversion circuit 20 may further include a second bypass protection module 26 ; the second bypass protection module 26 is connected in parallel between the positive electrode and the negative electrode of the second battery string 12 .

[0148] Among them, the second bypass protection module 26 can shunt the current of the second output signal output by the second battery string 12, maintain the voltage stability of the second battery string 12, improve the photoelectric conversion efficiency of the second battery string 12, prevent the high-impedance second battery 120 in the second battery string 12 from overheating, protect each second battery 120 from thermal damage, and extend the service life of the second battery string 12; at the same time, the second bypass protection module 26 can also prevent reverse current that may occur due to voltage imbalance between the second batteries 120 in the second battery string 12, ensure the correct current direction, and protect the second battery string 12 from damage.

[0149] Optional, continue to refer to Figure 12 to Figure 14 The second bypass protection module 26 includes at least one second bypass diode D2 ; the second bypass diode D2 is connected in reverse parallel between the positive electrode and the negative electrode of the second battery string 12 .

[0150] The second bypass protection module 26 includes at least one second bypass diode D2, that is, the second bypass protection module 26 may include one or more second bypass diodes D2, which may be specifically designed according to actual needs, and the embodiment of the present invention does not specifically limit this.

[0151] In an optional embodiment, Figures 15 to 17 is a schematic diagram of the structure of three other junction boxes provided in an embodiment of the present invention, referring to Figures 15 to 17 The second battery string 12 may include n second battery groups 1200 connected in series; each second battery group 1200 includes at least one second battery 120 connected in series; n is a positive integer greater than or equal to 2; the second bypass protection module 26 includes n second bypass diodes D2; each second bypass diode D2 is connected in reverse parallel between each second battery group 1200 one by one.

[0152] The number of the second battery groups 1200 in the second battery string 12 may be the same as the number of the second bypass diodes D2 in the second bypass protection module 26 , that is, a second bypass diode D2 may be connected in reverse parallel to both ends of each second battery group 1200 .

[0153] It is understandable that in photovoltaic modules, due to some batteries in the photovoltaic modules being blocked, damaged, having manufacturing defects or inconsistent performance, these batteries cannot generate current normally, but instead become loads in the circuit, consuming the electrical energy generated by other normal batteries, thereby generating heat energy, causing the local temperature of the blocked batteries to rise significantly, forming hot spots, and as the number of batteries in the battery string increases, the hot spot phenomenon becomes more serious, thereby reducing the output power of the entire photovoltaic module. When the temperature in the hot spot area is too high, it will cause the solder joints of the battery cells to melt, accelerate the aging of the packaging materials, and even the battery itself to be damaged due to overheating, forming a permanent dark spot. The long-term hot spot effect will accelerate the aging process of the internal materials of the photovoltaic module and reduce the service life of the module.

[0154] This embodiment divides the second battery string 12 into a plurality of second battery groups 1200 connected in series, and reversely connects a second bypass diode D2 at both ends of each second battery group 1200. When a second battery 120 in the second battery group 1200 is blocked, the second bypass diode D2 is turned on to allow current to bypass the faulty second battery and protect the second battery group 1200 from being damaged by overheating, thereby effectively reducing the hot spot temperature of each second battery group 1200 in the second battery string 12 and effectively improving the life of the second battery string 12.

[0155] It should be noted that the above is only an exemplary description of the second bypass diode D2 being connected in parallel at both ends of each second battery group 1200 in the second battery string 12, and in the embodiment of the present invention, the first battery string may also include multiple first battery groups, and each first battery group may have a first bypass diode connected in reverse parallel at both ends, that is, the first bypass protection module may include a first bypass diode corresponding to each first battery group, and the function of each first bypass diode is similar to that of each second bypass diode. For details, please refer to the above description and will not be repeated here. The embodiment of the present invention does not limit the specific structure of the bypass protection module electrically connected at both ends of the first battery string and the second battery string, and can be designed according to actual needs. For the convenience of description, without special limitations, the embodiments of the present invention take the first battery string reversely connected in parallel with a first bypass diode and the second battery string reversely connected in parallel with a second bypass diode as an example to exemplify the technical solution of the embodiment of the present invention.

[0156] Based on the above embodiment, optionally, Fig.18 and Fig.19 is a schematic diagram of the structure of two other junction boxes provided in an embodiment of the present invention, referring to Fig.18 and Fig.19The junction box 30 further includes a positive terminal 32 and a negative terminal 33; the positive terminal 32 is used to output the positive signal converted by the voltage conversion circuit 20; the negative terminal 33 is used to output the negative signal converted by the voltage conversion circuit 20. In this way, the positive terminal 32 can be electrically connected to the positive input terminal of the DC device or the signal conversion circuit, and the negative terminal 33 can be electrically connected to the negative input terminal of the DC device or the signal conversion circuit, which is conducive to simplifying the wiring method between the junction box and the external device or circuit.

[0157] Based on the same inventive concept, an embodiment of the present invention further provides a laminated photovoltaic module, the laminated photovoltaic module includes a first battery string and a second battery string arranged in a stacked manner; the laminated photovoltaic module also includes a junction box provided in an embodiment of the present invention. Therefore, the laminated photovoltaic module provided in an embodiment of the present invention includes the technical features of the junction box provided in an embodiment of the present invention, and can achieve the beneficial effects of the junction box provided in an embodiment of the present invention. The similarities can be referred to the above description, and will not be repeated here.

[0158] Based on the above embodiment, optionally, Fig. 20 is a schematic diagram of a top view of a first battery string provided in an embodiment of the present invention, Fig.21 is a schematic diagram of a top view of a second battery string provided by an embodiment of the present invention, Fig. 22 is a schematic diagram of a top view of another second battery string provided by an embodiment of the present invention, with reference to Figure 20 to Figure 22 The first battery string 11 may include a plurality of first batteries 110 connected in series, and the second battery string 12 may include a plurality of second batteries 120 connected in series. In this case, the first battery 110 may include a perovskite battery, and the second battery 120 may include a crystalline silicon battery. With such an arrangement, the stacked photovoltaic module may have the dual characteristics of the perovskite battery and the crystalline silicon battery, thereby enabling the stacked photovoltaic module to have a higher photoelectric conversion efficiency.

[0159] Based on the above embodiment, optionally, refer to Figures 18 to 22 The first battery string 11 includes a plurality of first batteries 110, a first bus bar 111, and a second bus bar 112 connected in series in sequence; the first bus bar 111 is electrically connected to the positive electrode of the first battery 110 in the series connection, and the second bus bar 112 is electrically connected to the negative electrode of the first battery 110 in the series connection; the second battery string 12 includes a plurality of second batteries 120, a third bus bar 121, and a fourth bus bar 122 connected in series in sequence; the third bus bar 121 is electrically connected to the positive electrode of the first battery 120 in the series connection, and the fourth bus bar 122 is electrically connected to the negative electrode of the second battery 120 in the series connection; the voltage conversion circuit 20 of the junction box 30 is electrically connected to the first bus bar 111, the second bus bar 112, the third bus bar 121, and the fourth bus bar 122, respectively.

[0160] Among them, the first batteries 110 in the first battery string 11 are connected in series in sequence, which can be understood as, in two adjacent and series-connected first batteries 110, the negative electrode of the previous first battery 110 is electrically connected to the positive electrode of the next first battery 110; the positive electrode of the first first battery 110 in the series can be electrically connected to the first bus 111, and the negative electrode of the last first battery 110 in the series can be electrically connected to the second bus 112. At this time, the first bus 111 can be used as the positive electrode of the first battery string 11, and the second bus 112 can be used as the negative electrode of the first battery string 11, so that the first battery string 11 can be electrically connected to the voltage conversion circuit 20 through the first bus 111 and the second bus 112 respectively, which is conducive to simplifying the connection relationship between the first battery string 11 and the voltage conversion circuit 20.

[0161] Similarly, the first batteries 110 in the second battery string 12 are connected in series in sequence, which can be understood as, in two adjacent second batteries 120 connected in series, the negative electrode of the previous second battery 120 is electrically connected to the positive electrode of the next second battery 120; the positive electrode of the second battery 120 at the first position in the series can be electrically connected to the third bus 121, and the negative electrode of the second battery 120 at the last position in the series can be electrically connected to the fourth bus 122. At this time, the third bus 121 can be used as the positive electrode of the second battery string 12, and the fourth bus 122 can be used as the negative electrode of the second battery string 12, so that the second battery string 12 can be electrically connected to the voltage conversion circuit 20 through the third bus 121 and the fourth bus 122 respectively, which is conducive to simplifying the connection relationship between the second battery string 12 and the voltage conversion circuit 20.

[0162] Based on the above embodiment, optionally, Fig.23 is a schematic diagram of the film structure of a laminated photovoltaic module provided by an embodiment of the present invention, combined with reference Figure 20 to Figure 23 The laminated photovoltaic module 10 also includes a first glass substrate 13, a first battery layer 14, a first spacer layer 15 and a second battery layer 16; the first battery layer 14 includes a first battery 110; the second battery layer 16 includes the second battery 120; the second battery layer 16 is located on the front side of the first glass substrate 13, and the junction box 30 is arranged on the back side of the first glass substrate 13; the front and back sides of the first glass substrate 13 are opposite sides; the first spacer layer 15 is located on the side of the second battery layer 16 away from the first glass substrate 13; the first battery layer 14 is located on the side of the first spacer layer 15 away from the second battery layer 16; at least one through hole H is provided on the first glass substrate 13; the first bus bar 111, the second bus bar 112, the third bus bar 121 and the fourth bus bar 122 are electrically connected to the voltage conversion circuit through the through hole H.

[0163] The material of the first glass substrate 13 may include float glass, tempered glass or ultra-white glass, etc. The first glass substrate 13 is used to support the first battery layer 14 and the second battery layer 16 to improve the stability of the laminated photovoltaic module. The first spacer layer 15 may include an adhesive film, which may include one or more materials of polyolefins, polyesters or olefin copolymers. The first battery layer 14 may be attached to the second battery layer 16 through the first spacer layer 15. At the same time, the first spacer layer 15 may insulate the first battery 110 in the first battery layer 14 from the second battery 120 in the second battery layer 16 to prevent the signals of the first battery 110 and the second battery 120 from interfering with each other.

[0164] On the basis of the above embodiment, optionally, the laminated photovoltaic module 10 further includes a second glass substrate 17 located on a side of the first cell layer 14 away from the second cell layer 16 .

[0165] The second glass substrate 17 may cover the surface of the first battery layer 14, so that the first glass substrate 13 and the second glass substrate 17 cooperate to encapsulate the first battery 110 in the first battery layer 14 and the second battery 120 in the second battery layer 16, thereby reducing the damage of external factors such as dust, moisture, and oxygen to the first battery string 11 and the second battery string 12, and extending the service life of the first battery string 11 and the second battery string 12. The second glass substrate 17 may be located on the side facing the sunlight, and the material of the second glass substrate 17 may include fluorine-doped tin oxide (FTO) glass, indium tin oxide (ITO) glass, or zinc oxide (ZnO) glass, etc., which may be specifically designed according to actual needs, and the embodiment of the present invention does not specifically limit this.

[0166] Based on the above embodiment, optionally, continue to refer to Fig.23 The laminated photovoltaic module 10 may further include an adhesive layer 18 between the first glass substrate 13 and the second battery layer 16, so that the second battery layer 16 can be attached to the first glass substrate 13 through the adhesive layer 18, so that the second battery layer 16 and the first battery layer 14 thereon can be stably fixed on the first glass substrate 13, and the first glass substrate 13 can support and fix the first battery layer 14 and the second battery layer 16. The adhesive layer 18 may include an adhesive film, which may include one or more materials of polyolefins, polyesters or olefin copolymers, and may be specifically designed according to actual needs, and the embodiment of the present invention does not specifically limit this.

[0167] Based on the same inventive concept, an embodiment of the present invention also provides a photovoltaic system, which includes an inverter and the laminated photovoltaic module provided by the above embodiment of the present invention; the junction box of the laminated photovoltaic module includes at least a positive terminal and a negative terminal; the positive input terminal of the inverter is electrically connected to the positive terminal, and the negative input terminal of the inverter is electrically connected to the negative terminal.

[0168] For example, Fig.24 is a schematic diagram of a photovoltaic system provided by an embodiment of the present invention, such as Fig.24 As shown, the photovoltaic system 100 includes a stacked photovoltaic module 10 and an inverter 40. The stacked photovoltaic module 10 includes a junction box 30 provided in an embodiment of the present invention, and a first battery string 11 and a second battery string 12 that are stacked. At this time, the first battery string 11 and the second battery string 12 can be electrically connected to the positive input terminal of the inverter 40 through the positive terminal of the junction box 30, and electrically connected to the negative input terminal of the inverter 40 through the negative terminal of the junction box 30, so that the first output signal of the first battery string 11 and the second output signal of the second battery string 12 can be provided to the same inverter 40 after passing through the same junction box 30, so that the inverter 40 can simultaneously convert the first output signal of the first battery string 11 and the second output signal of the second battery string 12 into AC signals.

[0169] Among them, since the junction box of the stacked photovoltaic module provided by the embodiment of the present invention includes a voltage conversion circuit, the voltage conversion circuit can at least perform voltage conversion on the first output signal of the first battery string, so that the voltage of the first output signal can be the same as the voltage of the second output signal of the second battery string, so that the first battery string and the second battery string of the stacked photovoltaic module can use the same inverter for signal conversion. Compared with the situation where inverters are set for the first battery string and the second battery string of the stacked photovoltaic module respectively, in the embodiment of the present invention, only one inverter is needed to invert the DC signal output by the stacked photovoltaic module into an AC signal, which is beneficial to reduce the number of inverters in the photovoltaic system, simplify the structure of the photovoltaic system, and thus help reduce the cost of the photovoltaic system.

[0170] In an optional embodiment, the inverter 40 may include a DC / AC converter, so that the inverter 40 can convert the DC signal output by the junction box 30 into an AC signal, and provide the AC signal to the AC device or incorporate it into the commercial power grid.

[0171] Optional, Fig.25 is a schematic diagram of the structure of another photovoltaic system provided by an embodiment of the present invention, such as Fig.25 As shown, when the photovoltaic system 100 includes a plurality of laminated photovoltaic modules 10 , the junction boxes 30 of the laminated photovoltaic modules 10 are connected in series.

[0172] Among them, after the first output signal of the first battery string 11 and the second output signal of the second battery string 12 in the stacked photovoltaic module 10 pass through the junction box 30 of the stacked photovoltaic module 10, the first output signal of the first battery string 11 can have the same voltage as the second output signal of the second battery string 12, so that the positive terminal and the negative terminal of the junction box 30 can output the first output signal and the second output signal at the same time. When a photovoltaic system includes a plurality of laminated photovoltaic modules 10, it is not necessary to connect the first battery string 11 and the second battery string 12 of each laminated photovoltaic module 10 separately. It is only necessary to connect each laminated photovoltaic module 10 in series through its respective junction box and then electrically connect it to the inverter 40. That is, in the two connected laminated photovoltaic modules 10, the negative terminal of the junction box 30 of the previous laminated photovoltaic module 10 is electrically connected to the positive terminal of the junction box 30 of the next laminated photovoltaic module 10, and the positive terminal of the junction box 30 of the laminated photovoltaic module 10 in the first series connection is electrically connected to the positive input terminal of the inverter 40, and the negative terminal of the junction box 30 of the laminated photovoltaic module 10 in the last series connection is electrically connected to the negative input terminal of the inverter 40. In this way, each laminated photovoltaic module 10 can be electrically connected to the same inverter 40 after being connected in series, which is conducive to simplifying the connection relationship of the laminated photovoltaic modules 10, thereby simplifying the structure of the photovoltaic system and reducing the cost of the photovoltaic system.

[0173] It can be understood that the photovoltaic system of this embodiment includes the laminated photovoltaic components of the above-mentioned embodiment, so that the photovoltaic system of this embodiment has the technical characteristics of the laminated photovoltaic components of the above-mentioned embodiment and can achieve the beneficial effects of the laminated photovoltaic components provided by the above-mentioned embodiment. The similarities can be referred to the above description and will not be repeated here.

[0174] Based on the same inventive concept, an embodiment of the present invention also provides an inverter suitable for a stacked photovoltaic module, wherein the stacked photovoltaic module includes a first battery string and a second battery string arranged in a stacked manner, and the inverter includes a signal conversion circuit and a voltage conversion circuit provided by any embodiment of the present invention; the voltage conversion circuit is used to convert the voltage of the first battery string and / or the second battery string, and then output a DC signal of the stacked photovoltaic module; the signal conversion circuit is electrically connected to the voltage conversion circuit; the signal conversion circuit is used to convert the DC signal into an AC signal.

[0175] For example, Figure 26 to Figure 28 is a schematic diagram of the structure of three inverters provided in the embodiment of the present invention, referring to Figure 26 to Figure 28The inverter 60 includes a voltage conversion circuit 20 and a signal conversion circuit 50. The first output signal of the first battery string 11 of the laminated photovoltaic module 10 and / or the second output signal of the second battery string 12 can have the same voltage after voltage conversion by the voltage conversion circuit 20, so that the voltage conversion circuit 20 can simultaneously provide the first output signal and the second output signal with the same voltage to the signal conversion circuit 50 for signal conversion. In this way, there is no need to respectively set the corresponding signal conversion circuit 50 for the first battery string 11 and the second battery string 12 of the laminated photovoltaic module 10, so that the first output signal of the first battery string 11 and the second output signal of the second battery string 12 can be converted by the same signal conversion circuit 50, which is conducive to simplifying the structure of the inverter 60 and reducing the cost of the inverter 60.

[0176] Optionally, the signal conversion circuit 50 may include a DC / AC converter.

[0177] The DC / AC converter may include a switch circuit and a control circuit, etc. The switch circuit may be implemented by a transistor, a power tube or a relay, etc. The control circuit may control the on or off state of the switch circuit by means of pulse width modulation (PWM) technology, so that the control circuit controls the frequency and amplitude of the output AC signal, etc. When the switch circuit is on, the first output signal and the second output signal with a set voltage may form a loop between the switch circuit and the load; and when the switch circuit is off, the current directions of the first output signal and the second output signal with a set voltage change to form another loop, so that by continuously switching the on and off states of the switch circuit, the DC signals of the first output signal and the second output signal with a set voltage may be converted into AC signals.

[0178] In addition, the DC / AC converter may also include a filtering circuit and a protection circuit. The filtering circuit can filter and de-noise the converted AC signal to remove high-frequency harmonics; the protection circuit can protect other components in the DC / AC and other equipment electrically connected to the DC / AC converter, thereby ensuring the conversion efficiency and stability of the DC / AC converter.

[0179] It can be understood that the inverter of this embodiment includes the voltage conversion circuit of any embodiment of the present invention, so that the inverter of this embodiment has the technical characteristics of the voltage conversion circuit of the above embodiment and can achieve the beneficial effects of the voltage conversion circuit provided by the above embodiment. The similarities can be referred to the above description and will not be repeated here.

[0180] Based on the same inventive concept, an embodiment of the present invention further provides a photovoltaic system, which includes at least one laminated photovoltaic module and the inverter provided by the above embodiment of the present invention. The laminated photovoltaic module includes a first battery string and a second battery string arranged in a stacked manner; and the inverter is electrically connected to the first battery string and the second battery string respectively.

[0181] For example, Fig.29 is a schematic diagram of the structure of another photovoltaic system provided by an embodiment of the present invention, such as Fig.29 As shown, the photovoltaic system 200 includes a stacked photovoltaic module 10 and an inverter 60. The first cell string 11 and the second cell string 12 in the stacked photovoltaic module 10 are both electrically connected to the inverter 60, so that the first output signal of the first cell string 11 and the second output signal of the second cell string 12 in the stacked photovoltaic module 10 can be converted into an AC signal using the same inverter 60, thereby eliminating the need to separately set up inverters for the first cell string 11 and the second cell string 12, which is beneficial to simplifying the structure of the photovoltaic system and reducing the cost of the photovoltaic system.

[0182] It is understandable that the first cell string and the second cell string in the laminated photovoltaic module in the present embodiment are different types of solar cell strings, which can be designed according to actual needs, and the present embodiment does not specifically limit this. In an optional embodiment, the first cell string 11 may include a plurality of perovskite cells connected in series; the second cell string 12 may include a plurality of crystalline silicon cells connected in series.

[0183] It can also be understood that the photovoltaic system includes at least one laminated photovoltaic module, that is, the photovoltaic system may include one or more laminated photovoltaic modules, which can be specifically designed according to actual needs, and the embodiment of the present invention does not specifically limit this.

[0184] In an optional embodiment, Figure 30 to Figure 32 is a schematic diagram of the structure of three photovoltaic systems provided by the embodiments of the present invention, referring to Figure 30 to Figure 32 When the photovoltaic system 200 includes a plurality of laminated photovoltaic modules 10 , the first cell strings 11 of each laminated photovoltaic module 10 are connected in series, and the second cell strings 12 of each laminated photovoltaic module 10 are connected in series.

[0185] Among them, the series connection of the first battery string 11 of each stacked photovoltaic module 10 can be understood as that the positive electrode of the first battery string 11 of the stacked photovoltaic module 10 at the first end of the series connection is electrically connected to the positive input terminal of the first maximum power tracking module 21 in the inverter 60, and the negative electrode of the first battery string 11 of the stacked photovoltaic module 10 at the end of the series connection is electrically connected to the negative input terminal of the first maximum power tracking module 21 in the inverter 60. In addition, the negative electrode of the first battery string 11 of the previous stacked photovoltaic module 10 is electrically connected to the positive electrode of the first battery string 11 of the next stacked photovoltaic module 10.

[0186] Similarly, Fig.32 For example, the series connection of the second cell string 12 of each stacked photovoltaic module 10 can be understood as follows: the positive electrode of the second cell string 12 of the stacked photovoltaic module 10 at the first in the series is electrically connected to the positive input terminal of the second maximum power tracking module 23 in the inverter 60, and the negative electrode of the second cell string 12 of the stacked photovoltaic module 10 at the end of the series is electrically connected to the negative input terminal of the second maximum power tracking module 23 in the inverter 60. In addition, the negative electrode of the second cell string 12 of the previous stacked photovoltaic module 10 is electrically connected to the positive electrode of the second cell string 12 of the next stacked photovoltaic module 10.

[0187] By connecting the first battery strings 11 of each stacked photovoltaic module 10 in series and connecting the second battery strings 12 of each stacked photovoltaic module 10 in series, this embodiment can make the first output signals and the second output signals output by the plurality of interconnected stacked photovoltaic modules 10 have a relatively large voltage, thereby ensuring that the plurality of interconnected stacked photovoltaic modules 10 can generate relatively high electrical energy to meet the power demand of the municipal power grid and / or AC equipment.

[0188] Based on the above embodiment, optionally, Fig.33 is a schematic diagram of a top view of another first battery string provided by an embodiment of the present invention, Fig.34 FIG. 1 is a schematic diagram of a top view of another second battery provided by an embodiment of the present invention, referring to FIG. Figure 33 to Figure 34 The first battery string 11 includes a plurality of first batteries 110, a first bus bar 111, and a second bus bar 112 connected in series in sequence; the first bus bar 111 is electrically connected to the positive electrode of the first battery 110 in the series connection, and the second bus bar 112 is electrically connected to the negative electrode of the first battery 110 in the series connection; the second battery string 12 includes a plurality of second batteries 120, a third bus bar 121, and a fourth bus bar 122 connected in series in sequence; the third bus bar 121 is electrically connected to the positive electrode of the second battery 120 in the series connection, and the fourth bus bar 122 is electrically connected to the negative electrode of the second battery 120 in the series connection; wherein each first battery string 11 is connected in series through the first bus bar 111 and the second bus bar 112, and each second battery string 12 is connected in series through the third bus bar 121 and the fourth bus bar 122.

[0189] Among them, the first batteries 110 in the same first battery string 11 are connected in series and / or in parallel, and the second batteries 120 in the same second battery string 12 can also be connected in series and / or in parallel. The specific design can be based on actual needs, and the embodiment of the present invention does not make specific limitations on this.

[0190] For example, Fig.32 and Fig.33As shown, taking the series connection of each first battery 110 in the same first battery string 11 as an example, the negative electrode of the previous first battery 110 in two adjacent first batteries 110 connected in series can be electrically connected to the positive electrode of the next first battery 110, the first battery 110 at the head of the series can be electrically connected to the inverter 60 through the first bus bar 111, and the negative electrode of the first battery 110 at the end of the series can be electrically connected to the inverter 60 through the second bus bar 112, so that each first battery 110 connected in series can be electrically connected to the inverter 60 through the first bus bar 111 and the second bus bar 112, respectively. At this time, when the photovoltaic system 200 includes multiple stacked photovoltaic modules 10, and the first battery strings 11 of each stacked photovoltaic module 10 are connected in series, the first bus bar 111 of the stacked photovoltaic module 10 at the first position in the series can be electrically connected to the positive input terminal of the first maximum power tracking module 21 of the inverter 60, and the second bus bar 112 of the stacked photovoltaic module at the last position in the series can be electrically connected to the negative input terminal of the first maximum power tracking module 21 of the inverter 60. Of the two adjacent stacked photovoltaic modules 10 connected in series, the second bus bar 112 of the previous stacked photovoltaic module 10 can be electrically connected to the first bus bar 111 of the next stacked photovoltaic module 10. In this way, by providing the first bus bar 111 and the second bus bar 112 in each stacked photovoltaic module 10, it is possible to achieve mutual electrical connection between the first battery strings 11 in each stacked photovoltaic module 10, and to achieve electrical connection between the first battery strings 11 in the stacked photovoltaic module 10 and the inverter 60, thereby helping to simplify the connection method of each first battery string 11, simplifying the structure of the photovoltaic system 200, reducing the difficulty of assembling the photovoltaic system 200, and further helping to reduce the cost of the photovoltaic system 200.

[0191] Similarly, if Fig.32 and Fig.34As shown, taking the case where the second cells 120 in the same second cell string 12 are connected in series as an example, at this time, the second cells 120 connected in series can be electrically connected to the inverter 60 through the third bus bar 121 and the fourth bus bar 122, respectively. At this time, when the photovoltaic system 200 includes a plurality of laminated photovoltaic modules 10, and the second cell strings 12 of each laminated photovoltaic module 10 are connected in series, the third bus bar 121 of the laminated photovoltaic module 10 at the first position in the series connection can be electrically connected to the positive input terminal of the second maximum power tracking module 23 of the inverter 60, and the fourth bus bar 122 of the laminated photovoltaic module 10 at the last position in the series connection can be electrically connected to the negative input terminal of the second maximum power tracking module 23 of the inverter 60. In the two laminated photovoltaic modules 10 connected in series and adjacent to each other, the fourth bus bar 122 of the previous laminated photovoltaic module 10 can be electrically connected to the third bus bar 121 of the next laminated photovoltaic module 10. Such a configuration can simplify the connection method of each second battery string 12, simplify the structure of the photovoltaic system 200, reduce the difficulty of assembling the photovoltaic system 200, and further help reduce the cost of the photovoltaic system 200.

[0192] Based on the above embodiment, optionally, Fig.35 Schematic diagram of the film structure of another laminated photovoltaic module provided by an embodiment of the present invention. Fig.35 As shown, the laminated photovoltaic module 10 also includes a first glass substrate 13, a first battery layer 14, a first spacer layer 15 and a second battery layer 16; the first battery layer 14 includes a first battery 110, and the second battery layer 16 includes a second battery 120; the second battery layer 16 is located on the front side of the first glass substrate 13, and the first spacer layer 15 is located on the side of the second battery layer 16 away from the first glass substrate 13; the first battery layer 14 is located on the side of the first spacer layer 15 away from the second battery layer 16.

[0193] The material of the first glass substrate 13 may include float glass, tempered glass or ultra-white glass, etc. The first glass substrate 13 is used to support the first battery layer 14 and the second battery layer 16 to improve the stability of the laminated photovoltaic module. The first spacer layer 15 may include an adhesive film, which may include one or more materials of polyolefins, polyesters or olefin copolymers. The first battery layer 14 may be attached to the second battery layer 16 through the first spacer layer 15. At the same time, the first spacer layer 15 may insulate the first battery 110 in the first battery layer 14 from the second battery 120 in the second battery layer 16 to prevent the signals of the first battery 110 and the second battery 120 from interfering with each other.

[0194] On the basis of the above embodiment, optionally, the laminated photovoltaic module 10 may further include a second glass substrate 17 located on the side of the first battery layer 14 away from the second battery layer 16, and the second glass substrate 17 may cover the surface of the first battery layer 14, so that the first glass substrate 13 and the second glass substrate 17 cooperate to encapsulate the first battery string 11 of the first battery layer 14 and the second battery string 12 of the second battery layer 16, reduce the damage of external factors such as dust, moisture, oxygen, etc. to the first photovoltaic module and the second photovoltaic module, and extend the service life of the first battery string 11 and the second battery string 12. Among them, the second glass substrate 17 may be located on the side facing the sunlight, and the material of the second glass substrate 17 may include fluorine-doped tin oxide (FTO) glass, indium tin oxide (ITO) glass or zinc oxide (ZnO) glass, etc., which can be specifically designed according to actual needs, and the embodiment of the present invention does not make specific limitations on this.

[0195] On the basis of the above embodiment, optionally, the laminated photovoltaic module 10 may further include an adhesive layer 18 between the first glass substrate 13 and the second battery layer 16, so that the second battery layer 16 can be attached to the first glass substrate 13 through the adhesive layer 18, so that the second battery layer 16 and the first battery layer 14 thereon can be stably fixed on the first glass substrate 13, and the first glass substrate 13 can support and fix the first battery layer 14 and the second battery layer 16. Among them, the adhesive layer 18 may include an adhesive film, and the adhesive film may include one or more materials of polyolefins, polyesters or olefin copolymers, and may be specifically designed according to actual needs, and the embodiment of the present invention does not specifically limit this.

[0196] In addition, at least one first through hole H1 and at least one second through hole H2 are provided on the first glass substrate 13; the first bus bar 111 and the second bus bar 112 extend to the back side of the first glass substrate 13 through the first through hole H1; the third bus bar 121 and the fourth bus bar 122 extend to the back side of the first glass substrate 13 through the second through hole H2, so as to realize electrical connection with other laminated photovoltaic modules 10 and / or inverter 60 from the back side of the first glass substrate 13, prevent the light receiving area of ​​the first cell string 11 and the second cell string 12 from being affected by the mutual electrical connection of the laminated photovoltaic modules 10, and help improve the photoelectric conversion efficiency of the first cell string 11 and the second cell string 12 while simplifying the connection method of each laminated photovoltaic module 10.

[0197] It is understandable that at least one first through hole H1 and at least one second through hole H2 are provided in the first glass substrate 13, that is, one or more first through holes H1 and one or more second through holes H2 may be provided in the first glass substrate 13, and the number of the first through holes H1 may be the same as or different from the number of the second through holes H2, and may be specifically designed according to actual needs, and the embodiment of the present invention does not specifically limit this. At the same time, the arrangement positions of the first through hole H1 and the second through hole H2 may be determined according to the actual connection mode of the first battery string and the second battery string, and the embodiment of the present invention does not specifically limit this.

[0198] In a possible embodiment, Fig.33 and Fig.34 As shown, the first through hole H1 and the second through hole H2 can be both arranged on one side of each first battery 110 and each second battery 120, and the first through hole H1 and the second through hole H2 can be both close to the same side of the first glass substrate 13, so that the stacked photovoltaic module can be electrically connected to other stacked photovoltaic modules and / or inverters from the same side of the first glass substrate 13, which is conducive to simplifying the assembly method of the photovoltaic system.

[0199] Based on the above embodiment, optionally, continue to refer to Fig.33 and Fig.34 The first glass substrate 13 may include a first through hole H1 and two second through holes H2 ( H21 and H22 ) close to the same side, and the first through hole H1 may be located in a region between the two second through holes H21 and H22 .

[0200] The photovoltaic system provided by the embodiment of the present invention includes the inverter provided by the embodiment of the present invention. Therefore, the photovoltaic system provided by the embodiment of the present invention includes the technical features of the inverter provided by any embodiment of the present invention, and can achieve the beneficial effects of the inverter provided by any embodiment of the present invention. The similarities can be referred to the above description and will not be repeated here.

[0201] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A voltage conversion circuit suitable for a laminated photovoltaic module, characterized in that: The laminated photovoltaic module comprises a first battery string and a second battery string arranged in a stacked manner, and the voltage conversion circuit comprises: a first maximum power tracking module and a first voltage conversion module; The first maximum power tracking module is electrically connected to the first battery string and the first voltage conversion module respectively; the first maximum power tracking module is used to track the maximum output power of the first battery string and output a first output signal of the first battery string at the maximum power; The first voltage conversion module is used to convert the voltage of the first output signal so that the voltage of the first output signal is equal to the voltage of the second output signal of the second battery string.

2. The voltage conversion circuit according to claim 1, characterized in that: The first voltage conversion module includes a voltage conversion unit and a voltage feedback unit; The voltage feedback unit is electrically connected to the voltage conversion unit and the second battery string respectively; the voltage feedback unit is used to obtain the second output signal of the second battery string and feed back the voltage of the second output signal to the voltage conversion unit; The voltage conversion unit is also electrically connected to the first maximum power tracking module; the voltage conversion unit is used to convert the voltage of the first output signal into the voltage of the second output signal according to the voltage of the second output signal.

3. The voltage conversion circuit according to claim 2, characterized in that: The voltage conversion unit includes a DC / DC converter.

4. The voltage conversion circuit according to claim 2, characterized in that: Also includes: A second maximum power tracking module; The second maximum power tracking module is at least electrically connected to the second battery string; the second maximum power tracking module is at least used to track the maximum output power of the second battery string and output a second output signal of the second battery string.

5. The voltage conversion circuit according to claim 4, characterized in that: The positive input terminal of the second maximum power tracking module is electrically connected to the positive output terminal of the voltage conversion unit and the positive electrode of the second battery string, and the negative input terminal of the second maximum power tracking module is electrically connected to the negative output terminal of the voltage conversion unit and the negative electrode of the second battery string.

6. The voltage conversion circuit according to claim 4, characterized in that: The positive input terminal of the second maximum power tracking module is electrically connected to the positive electrode of the second battery string, and the negative input terminal of the second maximum power tracking module is electrically connected to the negative electrode of the second battery string; the positive output terminal of the second maximum power tracking module is electrically connected to the positive input terminal of the voltage feedback unit, and the negative output terminal of the second maximum power tracking module is electrically connected to the negative input terminal of the voltage feedback unit.

7. The voltage conversion circuit according to claim 6, characterized in that: The positive output terminal of the second maximum power tracking module is connected in parallel with the positive output terminal of the voltage conversion unit, and the negative output terminal of the second maximum power tracking module is connected in parallel with the negative output terminal of the voltage conversion unit.

8. The voltage conversion circuit according to claim 1, characterized in that: Also includes: a second voltage conversion module; The second voltage conversion module is electrically connected to the second battery string; the second voltage conversion module is used to convert the voltage of the second output signal of the second battery string into a set voltage; The first voltage conversion module is specifically configured to convert the voltage of the first output signal into the set voltage.

9. The voltage conversion circuit according to claim 8, characterized in that: Also includes: A second maximum power tracking module; The second voltage conversion module is electrically connected to the second battery string through the second maximum power tracking module; the second maximum power tracking module is used to track the maximum output power of the second battery string and output a second output signal of the second battery string.

10. The voltage conversion circuit according to claim 8, characterized in that: The first voltage conversion module and the second voltage conversion module both include a DC / DC converter.

11. The voltage conversion circuit according to claim 1, characterized in that: The power of the first output signal is greater than the power of the second output signal.

12. A junction box suitable for laminated photovoltaic modules, characterized in that: The laminated photovoltaic module comprises a first battery string and a second battery string which are stacked, and the junction box comprises: the voltage conversion circuit according to any one of claims 1-11.

13. The junction box according to claim 12, characterized in that: The voltage conversion circuit also includes a first bypass protection module; The first bypass protection module is connected in parallel between the positive electrode and the negative electrode of the first battery string.

14. The junction box according to claim 13, characterized in that: The first bypass protection module includes at least one first bypass diode; The first bypass diode is connected in reverse parallel between the positive electrode and the negative electrode of the first battery string.

15. The junction box according to claim 12, characterized in that: The voltage conversion circuit also includes a second bypass protection module; The second bypass protection module is connected in parallel between the positive electrode and the negative electrode of the second battery string.

16. The junction box according to claim 15, characterized in that: The second bypass protection module includes at least one second bypass diode; The second bypass diode is connected in reverse parallel between the positive electrode and the negative electrode of the second battery string.

17. The junction box according to claim 16, characterized in that: The second battery string includes n second battery groups connected in series; each of the second battery groups includes at least one second battery connected in series; n is a positive integer greater than or equal to 2; The second bypass protection module includes n second bypass diodes; each of the second bypass diodes is connected in reverse parallel between each of the second battery groups in a one-to-one correspondence.

18. The junction box according to claim 12, characterized in that: Also includes: a positive terminal and a negative terminal; The positive terminal is used to output the positive signal converted by the voltage conversion circuit; The negative electrode terminal is used to output the negative electrode signal converted by the voltage conversion circuit.

19. The junction box according to claim 12, characterized in that: Also includes: Box body; The voltage conversion circuit is integrated in the box body.

20. A laminated photovoltaic module, characterized in that: The laminated photovoltaic module comprises a first battery string and a second battery string which are stacked; the laminated photovoltaic module further comprises a junction box according to any one of claims 12-19.

21. The laminated photovoltaic module according to claim 20, characterized in that: The first battery string includes a plurality of first batteries, a first bus bar, and a second bus bar connected in series in sequence; the first bus bar is electrically connected to the positive electrode of the first battery at the first position in the series connection, and the second bus bar is electrically connected to the negative electrode of the first battery at the last position in the series connection; The second battery string comprises a plurality of second batteries, a third bus bar and a fourth bus bar connected in series in sequence; the third bus bar is electrically connected to the positive electrode of the first second battery in the series, and the fourth bus bar is electrically connected to the negative electrode of the last second battery in the series; The voltage conversion circuit of the junction box is electrically connected to the first bus bar, the second bus bar, the third bus bar, and the fourth bus bar, respectively.

22. The laminated photovoltaic module according to claim 21, characterized in that: Also includes: A first glass substrate, a first battery layer, a first spacer layer, and a second battery layer; the first battery layer includes the first battery; and the second battery layer includes the second battery; The second battery layer is located on the front side of the first glass substrate, and the junction box is arranged on the back side of the first glass substrate; the front and back sides of the first glass substrate are opposite sides; the first spacer layer is located on the side of the second battery layer away from the first glass substrate; the first battery layer is located on the side of the first spacer layer away from the second battery layer; At least one through hole is provided on the first glass substrate; the first bus bar, the second bus bar, the third bus bar and the fourth bus bar are electrically connected to the voltage conversion circuit through the through hole.

23. The laminated photovoltaic module according to claim 22, characterized in that: Also includes: A second glass substrate is located on a side of the first battery layer facing away from the second battery layer.

24. The laminated photovoltaic module according to claim 20, characterized in that: The first battery string includes a plurality of perovskite batteries connected in series, and the second battery string includes a plurality of crystalline silicon batteries connected in series.

25. A photovoltaic system, characterized in that: include: An inverter and at least one laminated photovoltaic module according to any one of claims 20 to 24; The junction box of the laminated photovoltaic module at least includes a positive terminal and a negative terminal; The positive input terminal of the inverter is electrically connected to the positive terminal, and the negative input terminal of the inverter is electrically connected to the negative terminal.

26. The photovoltaic system according to claim 25, characterized in that: When the photovoltaic system includes a plurality of laminated photovoltaic modules, the junction boxes of the laminated photovoltaic modules are connected in series.

27. An inverter suitable for laminated photovoltaic modules, characterized in that: The laminated photovoltaic module comprises a first battery string and a second battery string which are stacked, and the inverter comprises: a signal conversion circuit and a voltage conversion circuit according to any one of claims 1 to 11; The voltage conversion circuit is used to convert the voltage of the first battery string and / or the second battery string and output a DC signal of the laminated photovoltaic module; The signal conversion circuit is electrically connected to the voltage conversion circuit; the signal conversion circuit is used to convert the DC signal into an AC signal.

28. The inverter according to claim 27, characterized in that: The signal conversion circuit includes a DC / AC converter.

29. A photovoltaic system, characterized in that: include: At least one laminated photovoltaic module and the inverter according to any one of claims 27-28; The laminated photovoltaic module comprises a first battery string and a second battery string which are stacked; The inverter is electrically connected to the first battery string and the second battery string respectively.

30. The photovoltaic system according to claim 29, characterized in that: When the photovoltaic system includes a plurality of stacked photovoltaic modules, the first cell strings of each stacked photovoltaic module are connected in series, and the second cell strings of each stacked photovoltaic module are connected in series.

31. The photovoltaic system according to claim 29, characterized in that: The first battery string includes a plurality of first batteries, a first bus bar, and a second bus bar connected in series in sequence; the first bus bar is electrically connected to the positive electrode of the first battery at the first position in the series connection, and the second bus bar is electrically connected to the negative electrode of the first battery at the last position in the series connection; The second battery string comprises a plurality of second batteries, a third bus bar and a fourth bus bar connected in series in sequence; the third bus bar is electrically connected to the positive electrode of the first second battery in the series, and the fourth bus bar is electrically connected to the negative electrode of the last second battery in the series; The first battery strings are connected in series through the first bus bar and the second bus bar, and the second battery strings are connected in series through the third bus bar and the fourth bus bar.

32. The photovoltaic system according to claim 31, characterized in that: The laminated photovoltaic module further includes a first glass substrate, a first battery layer, a first spacer layer, and a second battery layer; the first battery layer includes the first battery, and the second battery layer includes the second battery; The second battery layer is located on the front side of the first glass substrate, and the first spacer layer is located on the side of the second battery layer away from the first glass substrate; the first battery layer is located on the side of the first spacer layer away from the second battery layer; At least one first through hole and at least one second through hole are provided on the first glass substrate; the first bus bar and the second bus bar extend to the back side of the first glass substrate through the first through hole; the third bus bar and the fourth bus bar extend to the back side of the first glass substrate through the second through hole.

33. The photovoltaic system according to claim 32, characterized in that: The laminated photovoltaic module further includes a second glass substrate located on a side of the first cell layer facing away from the second cell layer.

34. The photovoltaic system according to claim 29, characterized in that: The first battery string includes a plurality of perovskite batteries connected in series; the second battery string includes a plurality of crystalline silicon batteries connected in series.

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